var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
require('babel-register');
require('babel-polyfill'); // 部分es6方法不支持，引入后支持

///=======路由信息 （接口地址）开始 存放在./routes目录下===========//
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/student');
var loginRouter = require('./routes/login');
var uploadRouter = require('./routes/upload');

var app = express();

//设置跨域访问
app.all('*', function(req, res, next) {
   res.header("Access-Control-Allow-Origin", "*");
   res.header("Access-Control-Allow-Headers", "X-Requested-With, Content-Type, Accept, Access-Token");
   res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
//    res.header("X-Powered-By",' 3.2.1');
   res.header("Content-Type", "application/json;charset=utf-8");
   next();
});

// view engine setup
//=======模板 开始===========//
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
//=======模板 结束===========//

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

//在app中注册该接口 
app.use('/', indexRouter); 
app.use('/student', usersRouter);
app.use('/', loginRouter);
app.use('/', uploadRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
